HEATED OXYGEN SENSOR (HO2S) INSPECTION [WITHOUT CYLINDER DEACTIVATION (SKYACTIV-G 2.0, SKYACTIV-G 2.5)]

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HO2S Inspection

1.  Connect the M-MDS to the DLC-2.

2.  Switch the ignition ON (engine on).

3.  Warm up the engine to normal operating temperature.

4.  Access the following PIDs using the M-MDS. (See OBD ON-BOARD SYSTEM READINESS TEST [PCM (WITHOUT CYLINDER DEACTIVATION (SKYACTIV-G 2.0, SKYACTIV-G 2.5))].)

―  VSS (Vehicle speed)

―  RPM (Engine speed)

―  O2S12 (HO2S output voltage)

5.  Drive the vehicle and decelerate the engine speed by releasing the accelerator pedal fully when the engine speed is 3,000 rpm or more.

6.  Verify that the HO2S output voltage (PID: O2S12) is 0.3 V or less while decelerating as shown in the figure.

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•  If not as specified, replace the HO2S. (See HEATED OXYGEN SENSOR (HO2S) REMOVAL/INSTALLATION [WITHOUT CYLINDER DEACTIVATION (SKYACTIV-G 2.0, SKYACTIV-G 2.5)].)

HO2S Heater Inspection

Warning

•  A hot engine and exhaust system can cause severe burns. Turn off the engine and wait until they are cool before removing the exhaust system.

Caution

•  Do not allow flammable objects such as the taping for bundling a wiring harness to come into contact with the exhaust manifold and silencer.

1.  Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.)

2.  Lift up the vehicle.

3.  Remove the floor under cover (LH). (4WD) (See FLOOR UNDER COVER REMOVAL/INSTALLATION.)

4.  Remove the floor under cover. (2WD) (See FLOOR UNDER COVER REMOVAL/INSTALLATION.)

5.  Remove the insulator and brace bar. (2WD) (See EXHAUST SYSTEM REMOVAL/INSTALLATION [WITHOUT CYLINDER DEACTIVATION (SKYACTIV-G 2.0, SKYACTIV-G 2.5)].)

6.  Disconnect the HO2S connector.

7.  Measure the resistance between HO2S terminals C and D.

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•  If not as specified, replace the HO2S. (See HEATED OXYGEN SENSOR (HO2S) REMOVAL/INSTALLATION [WITHOUT CYLINDER DEACTIVATION (SKYACTIV-G 2.0, SKYACTIV-G 2.5)].)